<!--SIF Implementation Specification 2.2-6 (March 17, 2008)-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" targetNamespace="http://www.sifinfo.org/infrastructure/2.x" xmlns:sif="http://www.sifinfo.org/infrastructure/2.x" elementFormDefault="qualified">
  <xs:import namespace="http://www.w3.org/XML/1998/namespace" schemaLocation="imports/xml/xml.xsd" />
  <xs:complexType name="AssessmentItemType">
    <xs:sequence>
      <xs:element name="ItemLabel" type="xs:token" />
      <xs:element name="ItemName" minOccurs="0" nillable="true" type="xs:string" />
      <xs:element name="LearningStandardItems" minOccurs="0" nillable="true">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="LearningStandardItemRefId" maxOccurs="unbounded" type="sif:IdRefType" />
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="Stimulus" minOccurs="0" nillable="true" type="sif:AbstractContentElementType" />
      <xs:element name="Stem" minOccurs="0" nillable="true" type="sif:AbstractContentElementType" />
      <xs:element name="ResponseChoices" minOccurs="0" nillable="true">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="Choice" maxOccurs="unbounded">
              <xs:complexType>
                <xs:sequence>
                  <xs:element name="ChoiceLabel" minOccurs="0" nillable="true" type="xs:normalizedString" />
                  <xs:element name="ChoiceContent" type="sif:AbstractContentElementType" />
                  <xs:element name="CreditValue" minOccurs="0" nillable="true" type="xs:float" />
                </xs:sequence>
              </xs:complexType>
            </xs:element>
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="SIF_Metadata" minOccurs="0" nillable="true" type="sif:SIF_MetadataType" />
      <xs:element name="SIF_ExtendedElements" minOccurs="0" nillable="true" type="sif:SIF_ExtendedElementsType" />
    </xs:sequence>
    <xs:attribute name="RefId" use="required" type="sif:RefIdType" />
    <xs:attribute name="AssessmentFormRefId" use="required" type="sif:IdRefType" />
    <xs:attribute name="ResponseType" use="required">
      <xs:simpleType>
        <xs:restriction base="xs:token">
          <xs:enumeration value="multiple-choice" />
          <xs:enumeration value="multiple-multiple choice" />
          <xs:enumeration value="true-false" />
          <xs:enumeration value="fill-in-the-blank" />
          <xs:enumeration value="short-answer" />
          <xs:enumeration value="essay" />
        </xs:restriction>
      </xs:simpleType>
    </xs:attribute>
  </xs:complexType>

  <xs:element name="AssessmentItem" type="sif:AssessmentItemType" />

</xs:schema>